US3887859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-commutating frequency converter with additional charging arrangement
Assignee: Siemens AG
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Filing: 1974-04-25
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Granted: 1975-06-03
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Expires: 1994-04-25
Abstract
Abstract An improvement in a static frequency changer (cycloconverter) of the type having a d-c link and in which the controlled rectifiers of each half bridge of a self-commutating converter are connected with each other through commutation capacitors, the improvement being a recharging arrangement in which each half bridge of the line-controlled converter is supplemented by uncontrolled rectifiers to form a semicontrolled rectifier bridge, with a capacitor shunted across the output of each semicontrolled rectifier bridges coupled through a resistor and a coupling diode to each electrode of each commutation capacitor of the corresponding half-bridge of the self-commutating converter.
Inventors
- 👤 Klaus Hubner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:31
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/40; H02M5/42; H02M5/44; H02M5/443; H02M5/45; H02M5/4505
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
192 words
In a static frequency changer comprising a line commutated controlled converter configured as a rectifier bridge, a d-c link circuit and a self-commutating converter, in which selfcommutating converter all controlled rectifier valves which are tied to the same bus of the d-c link circuit are connected with each other through commutation capacitors, wherein the improvement comprises: a. a first set of supplementary uncontrolled rectifiers coupled to at least one half of the bridge of the line commutated converter so as to form a first semicontrolled rectifier bridge having as one terminal one bus of the d-c link circuit and as another terminal, the output of said uncontrolled rectifiers; b. a smoothing capacitor shunted across said one and another terminals; c. first series circuits each comprising a resistor and a decoupling diode coupling said another terminal to one side of each said commutation capacitor associated with controlled rectifiers in the self-commutating converter which are coupled to the bus of said d-c link forming said one terminal; and d. second series circuits each comprising a resistor and a decoupling diode coupling said another terminal to the other side of each of said commutation capacitors.
Claim 2
Dependent Claim
192 words
In a static frequency changer comprising a line commutated controlled converter configured as a rectifier bridge, a d-c link circuit and a self-commutating converter, in which selfcommutating converter all controlled rectifier valves which are tied to the same bus of the d-c link circuit are connected with each other through commutation capacitors, wherein the improvement comprises: a. a first set of supplementary uncontrolled rectifiers coupled to at least one half of the bridge of the line commutated converter so as to form a first semicontrolled rectifier bridge having as one terminal one bus of the d-c link circuit and as another terminal, the output of said uncontrolled rectifiers; b. a smoothing capacitor shunted across said one and another terminals; c. first series circuits each comprising a resistor and a decoupling diode coupling said another terminal to one side of each said commutation capacitor associated with controlled rectifiers in the self-commutating converter which are coupled to the bus of said d-c link forming said one terminal; and d. second series circuits each comprising a resistor and a decoupling diode coupling said another terminal to the other side of each of said commutation capacitors.
Claim 3
Dependent Claim
192 words
In a static frequency changer comprising a line commutated controlled converter configured as a rectifier bridge, a d-c link circuit and a self-commutating converter, in which self-commutating converter all controlled rectifier valves which are tied to the same bus of the d-c link circuit are connected with each other through commutation capacitors, wherein the improvement comprises: a. a first set of supplementary uncontrolled rectifiers coupled to at least one half of the bridge of the line commutated converter so as to form a first semicontrolled rectifier bridge having as one terminal one bus of the d-c link circuit and as another terminal, the output of said uncontrolled rectifiers; b. a smoothing capacitor shunted across said one and another terminals; c. first series circuits each comprising a resistor and a decoupling diode coupling said another terminal to one side of each said commutation capacitor associated with controlled rectifiers in the self-commutating converter which are coupled to the bus of said d-c link forming said one terminal; and d. second series circuits each comprising a resistor and a decoupling diode coupling said another terminal to the other side of each of said commutation capacitors.
Claim 4
Dependent Claim
192 words
In a static frequency changer comprising a line commutated controlled converter configured as a rectifier bridge, a d-c link circuit and a self-commutating converter, in which self-commutating converter all controlled rectifier valves which are tied to the same bus of the d-c link circuit are connected with each other through commutation capacitors, wherein the improvement comprises: a. a first set of supplementary uncontrolled rectifiers coupled to at least one half of the bridge of the line commutated converter so as to form a first semicontrolled rectifier bridge having as one terminal one bus of the d-c link circuit and as another terminal, the output of said uncontrolled rectifiers; b. a smoothing capacitor shunted across said one and another terminals; c. first series circuits each comprising a resistor and a decoupling diode coupling said another terminal to one side of each said commutation capacitor associated with controlled rectifiers in the self-commutating converter which are coupled to the bus of said d-c link forming said one terminal; and d. second series circuits each comprising a resistor and a decoupling diode coupling said another terminal to the other side of each of said commutation capacitors.
Claim 5
Dependent Claim
20 words
A static frequency changer according to claim 1 wherein the output of said self-commutating converter is coupled to a motor.
Claim 6
Dependent Claim
114 words
A static frequency changer according to claim 1 and further including a second set of uncontrolled rectifiers forming with the other half of the bridge of said line controlled converter a second semicontrolled rectifier bridge having as one terminal the other bus of the d-c link circuit and as another output terminal the output of said second set of uncontrolled rectifiers and third and fourth series circuits each comprising a resistor and decoupling diode coupling said another terminal of said second semicontrolled rectifier bridge respectively to the two sides of each of said commutation capacitor associated with controlled rectifiers in said self-commutating converter which are coupled to said other bus of said d-c link.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |